pppd: allow use of arbitrary interface names

[ppp.git] / pppd / sys-linux.c

diff --git a/pppd/sys-linux.c b/pppd/sys-linux.c
index b4a435d2a99368bdb48316c798961f1be8f08147..b832031f7e269648ad6e33207c8855b2da4a8b34 100644 (file)
--- a/pppd/sys-linux.c
+++ b/pppd/sys-linux.c
@@ -643,6 +643,21 @@ static int make_ppp_unit()
        }
        if (x < 0)
                error("Couldn't create new ppp unit: %m");
+
+       if (x == 0 && req_ifname[0] != '\0') {
+               struct ifreq ifr;
+               char t[MAXIFNAMELEN];
+               memset(&ifr, 0, sizeof(struct ifreq));
+               slprintf(t, sizeof(t), "%s%d", PPP_DRV_NAME, ifunit);
+               strncpy(ifr.ifr_name, t, IF_NAMESIZE);
+               strncpy(ifr.ifr_newname, req_ifname, IF_NAMESIZE);
+               x = ioctl(sock_fd, SIOCSIFNAME, &ifr);
+               if (x < 0)
+                   error("Couldn't rename interface %s to %s: %m", t, req_ifname);
+               else
+                   info("Renamed interface %s to %s", t, req_ifname);
+       }
+
        return x;
 }